serenity::client::rest
pub fn ack_message(channel_id: u64, message_id: u64) -> Result<()>
Marks a Channel as being "read" up to a certain Message. Any message past the given one will not be marked as read.
Channel
Message
Usually you should use this to mark the latest message as being read.
Note: Bot users should not use this, as it has no bearing on them whatsoever.